Air-pump.



V. H. MEYER.

AIR PUMP. l

APPLIOATION 11.31) DB0. 1s, 191s.

1,098,633, Patented June 2, 1914.

UNITED sTA'rpEs rAwrEN'r oEEIoE.

VERNON H. MEYER, OF CLEVELAND, OHIO, ASSIGNOR TO 'TI-IE "NATIONAL MOTOR SUPPLY COMPANY, OF CLEVELAND, 0R10, .A CORPORATION.

AIR-PUMP.

Application tiled December 13, 1913.

To all whom, t may concern Be it known that I, VERNON H. MEYER, citizen of the United States, residing at Cleveland, in the county of Cuyahoga and Sta te of Ohio, have invented certain new and useful ln'iprovements in Airl?umps, of which the following is a specification.

T his invention relates to air pumps, and particularly to air pumps adapted for attachment to the cylinder of a gas engine, and suitable for various purposes such as in- Hating a tire.

The object of the invention is to provide an improved pump characterized by novel features with respect to the construction thereof and with respect to the mode of operation.

ln use the pump is conveniently attached to the nipple or spark plug opening and it is operated by the compression and suction in the engine cylinder.

The invention is illustrated in the accompanying drawing which is a sectional view of the pump, shown applied to an engine f cylinder.

24 to the outlet 8. The cylinder' 20 has conveniently a hinged handle 25 which may be used for handling the pump when hot, to unscrew the same from the engine, inasmuch as the pump becomes quite hot during use.

Fitting within the cylinder 2() is a piston head 26 onto which is screwed a ring 27 provided with a suitable piston ring 28 and packing 29, and this ring is integral with a cap 30 having ports 31 leading to a space 32 between this cap and the piston head 26. A cylinder or trunk 33 is screwed onto the cap and has an air inlet 34 at the top or outer end. A flat leather valve l1 is confined between the lower end of the cylinder 33 and a shoulder on the cap 30, and controls ports 35 leading from the space 32 to the annular chamber A between the cylinders 33 and 20. A iiat ring valve 9 is located in said space 32 and controls the ports 31, a spring 36 pressing against the valve and tending to Specification of Letters Patent.

Patented J une 2, 1914.

serial no. 806,581.

hold the same closed, said spring being seated in a counterbore in the piston head 26. This piston head has an opening 7 establishing communication between the lower or power chamber B of the main cylinder and said space 32. The valve 9 opens inward and thevalve l1 opens outward, the former admitting air from the interior of the cylinder 33 to the space below the piston, and the latter admitting air from said space to the annular outlet chamber A from which air under compression will iiow through the valve 24: to service.

In operation, it will be understood that the pump is screwed onto the engine cylinder and is operated by the compression and vacuum therein. Vhen the engine piston pulls down, or is on the suction stroke, the piston 26 follows down and, also, the valve 9 opens, drawing air in through the ports 31. Part of this air passes into the chamber B and `thence into the engine cylinder, and part also passes through the ports 35 into the chamber A, the valve 11 lifting in consequence of the vacuum in said chamber A produced by inward stroke ot the piston. On the upward or compression stroke of the engine the pump piston 26 dwells momentarily at the inner end of the cylinder, until a quantity of air from the engine cylinder is forced through the passage 7 and ports 35 into the chamber A, to substantially equalize the pressure in the chambers A and `B, at which Vtime the excess area of the piston 26 exposed in the chamber B over the area of said piston in the chamber A, causes said piston to lift or move outwardly, thereby forcing out the air Yfrom the chamber A through the valve 2li. Assuming that the area of the piston 26 exposed in the chamber B is three times that exposed in the chamber A, the pressure delivered will be correspond ingly greater. At the same time the pressure in the chamber B closes the valve 9 against the atmospheric pressure and the valve il also closes because of the excess pressure in the chamber A. When the piston on its outward stroke passes the outlet port 12 an air cushion is formed in the top oli' the chamber A which prevents hammering, and a somewhat similar air cushion is formed at the end of the inward stroke when the extension 39 on the piston 26 passes the counterbore L0 at the inner end of the cylinder 20. The operation above described is repeated at successive suction and compression strokes of the main piston of the engine.

It will be understood that this pump is applied to one cylinder of a multi-cylinder engine the cylinder to which it is applied having the spark plug removed and the pump screwed in its place, and on the suction stroke the inlet of air through the pump as above described will prevent the suction of any gas from the carbureter into the engine cylinder, such cylinder being thus cut out of the engine action. Accordingly only pure air, and not products of combustion, will be delivered by the pump.

I claim as my invention:

l. fr pump adapted for duid operation, comprising a cylinder having an opening at its inner end for connection with a fluid pressure and suction chamber, and a valved outlet at the other end, a piston in said cylinder, and a trunk attached to said piston, and working through the outer end of said cylinder, forming inner and outer chambers with differential areas on opposite sides of the piston, said piston having a valved ontlet from the inner to the outer chamber, and said inner chamber having a valved inlet from the atmosphere.

2. A pump comprising a cylinder having a valved outlet at one end, a piston in the cylinder having a trunk working through the end of the cylinder having said outlet, and forming power and outlet chambers with different areas on opposite sides o1e said piston, a valved inlet port opening from the trunk through said piston to the power chamber, and a valved outlet port opening through said piston from said power chamber to the outlet chamber.

8. A pump comprising a cylinder having a valved outlet at one end, a piston in the cylinder, a hollon7 trunk attached to one side of the piston and working through the end of the cylinder having said outlet, said trunk forming on outlet chamber in the cylinder with smaller piston area on that side of the piston than the power chamber on the opposite side of the piston, an inlet valve opening through the piston from said trunk to the power chamber, and an outlet valve opening through the piston from the power chamber to the outlet chamber.

4. A pump comprising a cylinder having an opening at its inner' end for connection with a fluid pressure and suction chamber, and a valve-d outlet at its outer end, a chambered piston in the cylinder, a hollow trunk attached to the outer side of the piston and working through the end of the cylinder, and forming an outlet chamber of smaller piston area than the power chamber on the opposite side of the piston, an inlet valve in the piston between the trunk and the chamber in the piston, and an outlet valve in the piston, between the chamber therein and said outlet chamber, said chamber in the piston being in open communication with the said power chamber.

5. e. pump comprising an outer cylinder having an opening at its inner end for connection with a fluid pressure and suction chamber, and a valved outlet at its outer end, a piston in the cylinder, a hollow inner cylinder attached to the outer side of the piston and working through the outer end of the outer cylinder, and forming with said cylinder an annular outlet chamber of smaller piston area than the power chamber on the opposite side of the piston, an inlet valve in said piston, between the interior of the inner cylinder and the power chamber, and an outlet valve in the piston, between said power chamber and the outlet chamber.

6. A pump adapted for fluid operation, comprising a cylinder having means at one end for connection with a fluid pressure and suction chamber, a piston in said cylinder, having a trunk working through the opposite end of the cylinder and forming inner and outer chambers with different areas on opposite sides of the piston, an outlet valve from the outer chamber, an inlet valve to the inner chamber, and a valved passage connecting said chambers.

In testimony whereof, I do a'ltx my signature in presence of two witnesses.

VERNON H. MEYER.

Vitnesses:

JOHN A. BOMMHARDT, 1B. Davis.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

